feat(admin): add global site settings API, tests and dashboard UI

src/pages/api/admin/settings/update.ts

@@ -0,0 +1,41 @@
+import type { APIRoute } from 'astro';
+import fs from 'node:fs/promises';
+import path from 'node:path';
+
+export const prerender = false;
+
+const DATA_DIR = process.env.DATA_DIR || path.join(process.cwd(), 'app', 'data');
+
+export const POST: APIRoute = async ({ request }) => {
+  try {
+    const { site_info, navigation } = await request.json();
+
+    if (!site_info || typeof site_info !== 'object') {
+      return new Response(JSON.stringify({ error: 'Gültige site_info Daten erforderlich' }), { status: 400 });
+    }
+
+    const configPath = path.join(DATA_DIR, 'site.config.json');
+    let config: any = {};
+
+    try {
+      const raw = await fs.readFile(configPath, 'utf-8');
+      config = JSON.parse(raw);
+    } catch {
+      // Fallback bei neuer Instanz
+      config = { site_info: {}, pages: [], navigation: [] };
+    }
+
+    // Update der globalen Eigenschaften
+    config.site_info = { ...config.site_info, ...site_info };
+    if (Array.isArray(navigation)) {
+      config.navigation = navigation;
+    }
+
+    await fs.mkdir(DATA_DIR, { recursive: true });
+    await fs.writeFile(configPath, JSON.stringify(config, null, 2), 'utf-8');
+
+    return new Response(JSON.stringify({ success: true, site_info: config.site_info }), { status: 200 });
+  } catch (error) {
+    return new Response(JSON.stringify({ error: 'Fehler beim Speichern der Einstellungen' }), { status: 500 });
+  }
+};